.header{
    height: 50px;
    width: 100%;
    .item{
        width: 300px;
        margin-right: 20px;
        height: 50px;
    }
    .select{
        width: 200px;
    }
    .addBtn{
        margin-left: auto;
    }
}
.buy_box{
    margin-top: 20px;
    .item{
        height: 40px;
        font-size: 16px;
        margin-bottom: 10px;
        span{
            font-weight: bold;
            font-size: 18px;
        }
    }
}